Add support for epd12in48b_v2

[vadimcn]

Here's a first draft of my driver for 12.48" module. Does this look like something you'd be willing to integrate?

[i-like-noodles]

I have the same device and same ESP32 and this worked for me. But mine is v1 because it did not come with a v2 sticker as the documentation says. This device has a slightly different startup procedure in the upstream code as seen here, though I'm not sure if it makes a difference. The only thing it seems to change is that the v2 startup flashes a lot more compared to v1 on mine.

I did a quick change to this to implement v1 as well, though I don't know if this is how you would want to implement it. See this diff.patch

[caemor]

We should move this to a more unspecific module (e.g. helper or directly at the top level below lib.rs), since it's nothing really specific to the epd12in48b_v2

[caemor]

Thanks for your work!

I would prefer to have the example in your own, separate repository, which we can link to from this repository.

The rest looks good to me.

[caemor]

I have the same device and same ESP32 and this worked for me. But mine is v1 because it did not come with a v2 sticker as the documentation says. This device has a slightly different startup procedure in the upstream code as seen here, though I'm not sure if it makes a difference. The only thing it seems to change is that the v2 startup flashes a lot more compared to v1 on mine.

I did a quick change to this to implement v1 as well, though I don't know if this is how you would want to implement it. See this diff.patch

It would be great to support v1 as well. I think we could solve this with feature-gating without much code duplication.